#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 205 + 5;

int n, m;
string s[N];

int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> n;
  rep(i, 1, n) cin >> s[i];
  set<string> st;
  rep(i, 1, n) rep(j, i + 1, n) {
    st.insert(s[i] + s[j]);
    st.insert(s[j] + s[i]);
  }
  cout << st.size();
  return 0;
}